﻿// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
// Licensed under the Apache License, Version 2.0.

using System;
using ImageMagick;
using Xunit;

#if Q8
using QuantumType = System.Byte;
#elif Q16
using QuantumType = System.UInt16;
#elif Q16HDRI
using QuantumType = System.Single;
#else
#error Not implemented!
#endif

namespace Magick.NET.Tests;

public partial class MagickImageTests
{
    public class TheEvaluateMethod
    {
        [Fact]
        public void ShouldThrowExceptionWhenArgumentsIsNull()
        {
            using var image = new MagickImage();

            Assert.Throws<ArgumentNullException>("arguments", () => image.Evaluate(Channels.Red, EvaluateFunction.Arcsin, null));
        }

        [Fact]
        public void ShouldThrowExceptionWhenArgumentsIsEmpty()
        {
            using var image = new MagickImage();

            Assert.Throws<ArgumentException>("arguments", () => image.Evaluate(Channels.Red, EvaluateFunction.Arcsin, Array.Empty<double>()));
        }

        [Fact]
        public void ShouldThrowExceptionWhenGeometryIsNull()
        {
            using var image = new MagickImage();

            Assert.Throws<ArgumentNullException>("geometry", () => image.Evaluate(Channels.Red, null, EvaluateOperator.Set, 0.0));
        }

        [Fact]
        public void ShouldThrowExceptionWhenGeometryIsInvalid()
        {
            using var image = new MagickImage();
            var geometry = new MagickGeometry(new Percentage(100), new Percentage(100));

            Assert.Throws<MagickCorruptImageErrorException>(() => image.Evaluate(Channels.Red, geometry, EvaluateOperator.Set, 0.0));
        }

        [Fact]
        public void ShouldChangeTheSpecifiedChannels()
        {
            using var image = new MagickImage(Files.Builtin.Logo);
            image.Evaluate(Channels.Red, EvaluateFunction.Arcsin, new double[] { 5.0 });

            ColorAssert.Equal(new MagickColor("#9068ffffffff"), image, 100, 295);

            image.Evaluate(Channels.Red, new MagickGeometry(0, 0, 100, 295), EvaluateOperator.Set, 0);

            ColorAssert.Equal(new MagickColor("#0ff"), image, 99, 195);
            ColorAssert.Equal(new MagickColor("#9068ffffffff"), image, 100, 295);

            image.Evaluate(Channels.Green, EvaluateOperator.Set, 0);

            ColorAssert.Equal(new MagickColor("#00f"), image, 99, 195);
            ColorAssert.Equal(new MagickColor("#90680000ffff"), image, 100, 295);
        }

        [Fact]
        public void ShouldUseWriteMask()
        {
            using var image = new MagickImage(MagickColors.Black, 2, 1);
            using var mask = new MagickImage(MagickColors.White, 2, 1);
            using var pixels = mask.GetPixelsUnsafe();
            pixels.SetPixel(0, 0, new QuantumType[] { 0, 0, 0 });

            image.SetWriteMask(mask);

            image.Evaluate(Channels.Red, EvaluateOperator.Set, Quantum.Max);

            ColorAssert.Equal(MagickColors.Red, image, 0, 0);
            ColorAssert.Equal(MagickColors.Black, image, 1, 0);
        }
    }
}
